Stacks is an outdoor bookshelf installation by artist David Harper made of books and wood. Via Cazenova College:

The theme for Harper’s installation: “these trees shall be my books,” comes from William Shakespeare’s “As You Like It,” but the goal of the work goes far beyond Orlando’s wish to immortalize Rosalind. Harper seeks to immortalize the love of knowledge, and the homage owed to the living things we use to create stores of knowledge for all to study. “STACKS” captures the transformation from living tree to store of knowledge.